There are two sets of rules for flying any aircraft: VFR and IFR. VFR stands for Visual Flight Rules. IFR stands for Instrument Flight Rules. Depending on the weather conditions a pilot may opt for one set of rules or the other. Mostly, it’s the weather that makes the pilot fly VFR or IFR. What is the difference between VFR and IFR flying? VFR normally means “see and avoid”. Under VFR, an aircraft is flown just like driving a car with eye movement and the pilot can see where he is going. VFR pilots maintain a ‘see and avoid’ principle when the visual meteorological conditions (VMC) are favorable. VFR is the usual way to fly a small craft. Under VRF, a pilot, however, cannot fly through clouds, which means they must go under, around, or divert if the clouds form a block en-route. In Nepal, for example, a IFR pilot can fly on the visibility of just 1,600 meters to 2,200 meters, depending on the aircraft type, says Ram Krishna Bhatta, an air traffic controller at Kathmandu's Tribhuvan